Homework Help:
Test Tomorow on work, and more

I have a test tomorrow and i lost all my papers on how to do this stuff. And i have this paper that has examples of all the problems i need to know how to do.

1. The problem statement, all variables and given/known data
1. A humming bird has a mass of 1.70 g. if the hummingbird ascends straight up with a net acceleration of 1.20 m/s^2, how much work does it do over a distance of 8 m.

2. The longest shish kabob ever made was 881 m long. Suppose the meat and vegetables need to be delivered in a cart from one end of this shish kebab to the other end. A cook pushes the cart by applying a force of 40.0 N at an angle that is 45º above the horizontal. If the force of friction acting on the cart is 28 N what is the net work done on the cart and its contents during the delivery.

First question: calculate mgh, the change in potential energy. Using the given acceleration find the final velocity and so (1/2)mv2, the change in kinetic energy. The change in total energy is the work done.

Second question: Work= force times distance. Since the distance is measured horizonatally, use the horizontal component of force.

Welcome to the PF, Rocket_guy. But you need to keep in mind that the rules here are that we do not post complete solutions to homework problems. Our task is to help the original poster (OP) figure out the problem on their own. We provide hints, pointers, reminders, and other guidance, but not explicit answers. We certainly appreciate your help in the homework forums, but please strive to be more tutorial in your help.

Welcome to the PF, Rocket_guy. But you need to keep in mind that the rules here are that we do not post complete solutions to homework problems. Our task is to help the original poster (OP) figure out the problem on their own. We provide hints, pointers, reminders, and other guidance, but not explicit answers. We certainly appreciate your help in the homework forums, but please strive to be more tutorial in your help.

Oh .. sry, didnt knew and I was just trying to help becoz the guy has a test tomorrow!